Measurements of Delta14C in soil CO2 efflux conducted at Harvard Forest, USA, between 1996 and 2010.
A data frame with the following 3 variables.
A numeric vector with the date of measurement in years
A numeric vector with the value of the Delta 14C value measured in CO2 efflux in per mil
A factor indicating the site where measurements were made. NWN: Northwest Near, Drydown: Rainfall exclusion experiment.
Samples for isotopic measurements of soil CO2 efflux were collected from chambers that enclosed an air headspace in contact with the soil surface in the absence of vegetation using a closed dynamic chamber system to collect accumulated CO2 in stainless steel traps with a molecular sieve inside. See Sierra et al. (2012) for additional details.
Sierra, C. A., Trumbore, S. E., Davidson, E. A., Frey, S. D., Savage, K. E., and Hopkins, F. M. 2012. Predicting decadal trends and transient responses of radiocarbon storage and fluxes in a temperate forest soil, Biogeosciences, 9, 3013-3028, doi:10.5194/bg-9-3013-2012